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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details)	Jun. 30, 2022	Dec. 31, 2021
Municipal debt securities
Investments available for sale
Percentage of debt securities	100.00%	100.00%
Municipal debt securities | Special revenue bonds
Investments available for sale
Percentage of debt securities	78.00%	77.10%
Municipal debt securities | General obligation bonds
Investments available for sale
Percentage of debt securities	21.90%	20.50%
Municipal debt securities | Certificate of participation bonds
Investments available for sale
Percentage of debt securities	0.00%	1.90%
Municipal debt securities | Tax allocation bonds
Investments available for sale
Percentage of debt securities	0.10%	0.50%
Corporate debt securities
Investments available for sale
Percentage of debt securities	100.00%	100.00%
Corporate debt securities | Financial
Investments available for sale
Percentage of debt securities	38.00%	33.70%
Corporate debt securities | Consumer, non-cyclical
Investments available for sale
Percentage of debt securities	17.10%	19.80%
Corporate debt securities | Communications
Investments available for sale
Percentage of debt securities	9.90%	11.40%
Corporate debt securities | Industrial
Investments available for sale
Percentage of debt securities	7.00%	7.00%
Corporate debt securities | Consumer, cyclical
Investments available for sale
Percentage of debt securities	7.20%	7.00%
Corporate debt securities | Energy
Investments available for sale
Percentage of debt securities	6.80%	6.00%
Corporate debt securities | Technology
Investments available for sale
Percentage of debt securities	6.00%	6.80%
Corporate debt securities | Utilities
Investments available for sale
Percentage of debt securities	6.00%	4.60%
Corporate debt securities | Basic materials
Investments available for sale
Percentage of debt securities	2.00%	3.70%

X

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Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column D))
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-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
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